Is Voltage Converter free to use?

Yes, Voltage Converter is completely free. No subscription, no credit card, and no account required — ever.

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No account is needed. Voltage Converter works instantly in your browser — just open the page and start using it.

Is Voltage Converter safe? Does it store my data?

Voltage Converter processes your data locally in your browser. Nothing is sent to or stored on our servers.

How do I use Voltage Converter?

Open the tool, enter or paste your input, and your result appears instantly. Use the copy button to save it. The whole process takes under a minute.

Voltage Converter

Convert voltage units like volt, millivolt, kilovolt.

Convert Units

From:

To:

Result:

Convert voltage measurements between volt, millivolt, kilovolt, and more.

What is Voltage Converter?

Voltage (electric potential difference) is the energy per unit charge between two points. It is the "pressure" that drives electric current through a circuit — analogous to water pressure in a pipe. Without voltage, no current flows.

Understanding the Units

Volt (V)

The SI derived unit of voltage. One volt drives one ampere through one ohm of resistance.

Common Uses: Batteries, household mains, electronics

Millivolt (mV)

One-thousandth of a volt.

Common Uses: Sensor outputs, bioelectrical signals, thermocouples

Conversion: 1 V = 1,000 mV

Kilovolt (kV)

One thousand volts.

Common Uses: Power transmission, X-ray machines, industrial equipment

Conversion: 1 kV = 1,000 V

Common Conversions

AA battery: 1.5 V
Smartphone battery (Li-ion): 3.7 V nominal
Car battery: 12 V (lead-acid)
Household mains (US): 120 V, (EU): 230 V
High-voltage power line: 110,000–765,000 V (110–765 kV)

Conversion Formulas

Ohm's Law: Voltage = Current × Resistance (V = I × R)
Power: Voltage = Power ÷ Current (V = P/I)
mV to V: V = mV ÷ 1,000
V to kV: kV = V ÷ 1,000
kV to V: V = kV × 1,000

Practical Examples

ECG (heart signal): ~1 mV amplitude measured on the skin

Laptop charger output: 19–20 V DC

Electric vehicle battery pack (Tesla): ~400 V DC

Power grid transmission: 230 kV to 765 kV to minimise energy loss

When to Use Each Unit

Millivolts (mV): Sensor outputs, bioelectrical signals (ECG, EEG), thermocouples

Volts (V): Batteries, household appliances, everyday electronics

Kilovolts (kV): Power transmission lines, X-ray and CT machines, industrial equipment

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